(with a figure it would have been easier for me to explain this but i cant do that in this blog. sorry but thats not a must) Consider two sets of two (very lengthy) hollow coaxial cylindrical tubes. In each set, the inner cylinder contains positively charged gaseous ions whereas the outer cylinder contains negatively charged gaseous ions. Conduction takes place by the movement of positively charged ions in the inner cylinder whereas in the outer cylinder conduction takes place by the ...